Control valve for compressor unloaders



.Mm 9 1923.. HA www Lmfm..

CONTROL VALVE FOR COMPRESSOR UNLOADERS.

FILED APR. 26, 1920.

pipe D now continues until the predetermined drop in pressure inthereceiver and pipe C occurs, When the pressure on the unloader end of thevalve, aided by the spring 16, seats the valve promptly to closereceiver pipe C, and open the unloader pipe D to the atmosphere, asshown in Fig. 1.

The construction shown in Figs. 2 and 3, and its operation, issubstantially the same as that of F ig. 1, exceptI that the two valveseats are not in line, but the valve is divided into two parts B and B2operating in different chambers, these two parts B', B2 being connectedby lever 19 so as to operate as one valve and secure the same result asin Fig. l, it being understood that as valve B lifts from seat 3 to openreceiver pipe C, valve B2 moves downward or is lowered onto seat 4, toclose connection to the atmosphere. The parts of the construction otherthan the valve proper being the same in construction and operation as inFig. 1, the same references are used for these parts.

It will be understood that, while the valve is especially intended foruse as a control valve in unloading compressors, it is applicable alsoto other uses in which a similar pressure controlledvalve is required,and such uses are Within the invention.

What l claim is:

1.l In a control valve ot the class describedgthe combination with acasing having opposed pressure inlet and exhaust valve seats and a porttor connection with the valve control mechanism, of a pressurecontrolled valve device coacting with said seats, a flow retardingpassage in the casing connecting the inlet with said .port andcontrolled by the pressure inlet end of the valve device, and aregulating valve in the liovv retarding passage. l

2. A control valve 'for air compressor unloaders or the like, consistingof a casing having a pressure inlet and an exhaust outlet, an unloaderor other pressure-operated connection, a valve device acting toalternately close and open the pressure inlet and exhaust outlet by itsmovement in oppositeA directions, a passage the casing connecting thepressure inlet with the unloader mechanism connection and controlled bythe pressure inlet end of the valve device, and a regulating valve insaid passage.

3. A control valve Yfor air compressor unloaders or the like, consistingoit a casing having a pressure inlet and an exhaust outlet, acylindrical valve device therein having reduced extensions adapted toclose the pressure inlet and exhaust outlet, a port for connection withthe unloadcr mechanism, a passage in the casing connecting thc pressureinlet with said port and the exhaust. outlet and controlled by thepressure inlet end oi' the valve device, and a regulating valve in saidpassage.

4.1n a control valve of the class dcscribed, the combination with acasing having opposed pressure inlet and exhaust valve seats, endchambers adjacent said valve seats Within the casing, a port :forconnection With the valve controlled mechanism, and a low retardingpassage connecting the inlet end 'chamber with said port at all times,of a pressure controlled valve device co-acting with said seats, and aregulating valve in said iiow retarding passage.

5. A control valve 'for air compressor unloaders or the like, consistingof a casing having a pressure inlet and an exhaust outlet, an unloaderor' other pressure-operated connection, a valve device actingtoalternately close and open the pressure inlet and exhaust outlet by itsmovement in opposite directions, apassage establishing immediateconnection between the pressure inlet and the unloader mechanism lwhenthe valve is moved to open the pressure inlet on a predetermined rise ofpressure therein, and a regulating valve controlling said passage.

6. A control valve for air compressor unloaders or the like, consistingof u casing .having a pressure inlet and exhaust outlet.

end chambers adjacent said inlet and outlet and vvithin the casing, acylindrical valve device having reduced extensions adapted to close thepressure inlet and exhaust outlet, a port. for connection with theuuloudcr mechanism, a passage connecting the inlet end chamber with saidport and the exhaust'l end chamber at all times, and a regulating valvecontrolling said passage.

7. A control valve for air compressor unloaders or the4 like, consistingot casing A having opposed pressure inlet and exhaust valve seats 3, 4,a vali/'e device having rcduced valve extensions 10, 11 vvithin chambers12, 13 co-acting with said seats. connection' l) connecting with theunloudcr mechanism, passage 15 in casing A connecting vchambers 12, 13with connection D and needle valve 6 controlling passage 15.

. ln testimony whereof. l have hereunto set .my hand.

HARRY FELDBSH.

